body {
  background-image: url('/src/assets/picture/background.png'); /* 设置背景图片 */
  background-size: cover; /* 背景图片覆盖整个页面 */
  background-position: center; /* 背景图片居中 */
  margin: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  color: white;
}
